Straight-bar knitting machine



0d; 29, 1940. w. -r AL 2,219,715

STRAIGHT-BAR KNITTING MACHINE Filed Feb. 15, 1940 2 Sheets-Sheet 1 Oct. 29, 1940. H. w. START El m.

STRAIGHT-BAR KNITTING MACHINE Filed Feb. 15, 1940 2 Sheets-Sheet 2 Patented Oct. 29, 19

STRAIGHT-BAR KNITTING MACHINE Harry Wilfred Start, Carlton, and Ernest Start,

Wilford, England, assignors to George Blackburn and Sons Limited, Nottingham, England Application February 15, 1940, Serial No. 319,170 In Great Britain November 25, 1938 8 Claims.

This invention relates to means for preventing the sinkers in straight-bar knitting machines of the Cotton type from becoming loose in the sley plates in which they are carried, and refers to 5 improvements in the brake mechanism provided for this purpose in which a narrow bar is slidable in a longitudinal recess provided for it in the inner face of one of the sinker sley bars and is formed with saw gates which register with those 19 in the face of thesley bar, and this register is insured as far as possible, by cutting the gates in the sliding bar at the same time as those in the sley bar. The sinkers are located inthe gates in this sliding bar as well as in those in the sley bar, and one or more springs are employed to maintain end pressure on the end of the sliding bar so as to apply a braking pressure to all the sinkers.

with this arrangement there is considerable difliculty in applying the brake pressure uniform- N ly to the whole of the sinkers, and the object of the present invention is to provide an arrangement that is free from this defect and is better adapted to apply the pressure to the whole of the sinkers uniformly and without failure.

' According to this invention, longitudinal channels across which the sinkers extend are provided at the sides of the longitudinal spring pressed bar to permit of the sinkers flexing so that the braking pressure is applied uniformly to the whole of thesinkers. The longitudinal channels may be formed by making the bars less in width at the part where they are provided with saw gates to receive the sinkers than at the remaining part. If preferred two bars may be provided, one being 35 spring pressed in the reverse direction to the other and provision may be made for removing the spring pressure on the longitudinal bar or bars whilst the sinkers are engaged by the catch bar.

0 This invention will now be more particularly described with reference to the accompanying drawings, in which Fig. 1 is an end elevation, Fig. 2 a front elevation.

45 Fig. 3 a plan, and

Fig. 4 a sectional elevation of a sinker sley constructed according to our invention.

Fig. 5 is a sectional elevation of an alternative form of construction.

Like letters indicate like parts throughout the drawings.

In one method of carrying out, our invention two longitudinal bars A A are located in a recess in the top sinker sley bar B. The sinker sley bar 55 and the longitudinal bars are provided with saw gates to receive the sinkers. That part of the longitudinal bars in which the saw gates are located are less in width than the remainder soas to provide longitudinal channels C between the sides of the recess in which the bars are located 6 and the sides of the bars and also a longitudinal channel B between the two bars. The sinkers E extend across these channels as shown in Fig. 4. The bars are pressed in a longitudinal direction by springs and in the arrangement, shown in Figs. 10 1 to 4 the spring associated with one bar isdisposed at the opposite end to that of the other bar so that pressure is exerted on both sides of the sinkers. As the sinkers extend across the channels provided at the sides of the longitudinal 15 bars they are able to flex to a certain extent and as a result the brake pressure is uniformly applied to the whole of the sinkers.

In order to apply the and pressure on'the longitudinal bars each bar is provided at one end with 39 a spring pressed plunger F and in order to adjust the spring pressure on the longitudinal barsthe springs G associated with each plunger are disposed between the head of the plunger and an adjusting screw H. r

In order to remove the pressure on the sinkers whilst they are engaged by the catch bar the following arrangement is adopted. The plungers F are slidably mounted in the adjusting screws H which are located in screw-"threaded openings in one end of arms J pivoted at K to the sinker sley.

Associated with the free ends of the arms J are cams L carried by brackets M secured on the catch bar N and when the latter is moved back out of engagement with the sinkers the cams L engage the free ends of the arms J as shown in Fig. 3 and the arms are rocked about their pivots and the spring pressure applied. When however the catch bar moves forward and engages with the sinkers the free ends of the arms J slide off the cams L and the spring pressure is released and the braking action removed from the sinkers until such time as the catch bar is moved back out of engagement with the sinkers.

In the alternative construction shown in Fig. 5 one longitudinal bar only is used. Channels across which the sinkers extend are provided as in the previous arrangement. Spring pressure is applied to the bar and provision may be made in a similar manner to release the pressure when the sinkers are engaged by the catch bar.

With the arrangement described the braking pressure is uniformly distributed over the whole of the sinkers and the defect of the arrangement adopted hitherto obviated.

Furthermore the braking pressure on the sinkas can be removed whilst the sinkers are engaged by the catch bar and unnecessary wear on the sinker sley bars obviated and as the brake pres- I sure is applied to the sinkers whilst they are disengaged from the catch bar there is no risk of the sinkers moving except when they are positively projected by the slur cock.

What we claim as our invention is:

10 1. In a straight-bar knitting machine a sinker sley,.a set oi sinkers, a longitudinal bar orbars disposed in a recess in the sinker sley and provided with gates which engage with the sinkers, longitudinal channels across which the sinkers ll extend disposed at the sides or the longitudinal bar or bars, means for exerting end pressure on each or the longitudinal bars and a catch bar for operating the sinkers, substantially as described.

2. In a straight-bar knitting machine, a sinker I sley, a set of sinkers, a longitudinal bar or bars disposed in a recess in the sinker sley and provided with gates to receive the sinkers and made iess in" width at the part where the gates are provided than at the remaining part to form lonll gitudinal-channels across which the sinkers extend, means for exerting end pressure on the longitudinal bar or bars and a catch bar for operating the sinkers, substantially as described.

3. In a straight-bar knitting machine, a sinker I sley, a set of sinkers, two longitudinal bars disposed in a recess in the sinker sley provided with gates which, engage with the sinkers, a longitudinal channel across which the sinkers extend disposed at the sides 01' the longitudinal bars,

8 means for exerting end pressure on one longitudinal bar in the reverse direction to the other and a catch bar for operating the sinkers, substantially-f as described.

4. In a straight-bar knitting machine, a sinker d0 sley. a set of sinkers, a longitudinal bar or bars disposed in a recess in the sinker sley provided with gates to engage with the sinkers, longitudinal channels across which the sinkers extend disposed at the sides of the longitudinal bar or bars,

48 a spring pressed plunger to engage with the end of each of the longitudinal bars and a catch bar to operate the sinkers, substantially as described.

5. In a straight-bar knitting machine, a sinker sley, a set 01' sinkers, a longitudinal bar or bars '0 disposed in a recess in the sinker sley provided with. gates to engage with the sinkers, longitudinal channels across which the sinkers extend tudinal channels across which the sinkers extend disposed at the sides of the longitudinal bars, means for exerting end pressure on each longitudinal bar, a catch bar for operating the sinkers and means associated with the catch bar ior removing the end pressure on each longitudinal bar when the catch bar moves into engagement with the sinkers, substantially as described.

7. In a straight-bar knitting machine, a sinker sley, a set 01' sinkers, a longitudinal bar or bars disposed in a recess in the sinker sley provided with gates to engage the sinkers, longitudinal channels across which the sinkers extend disposed at the sides oi the longitudinal bar or bars,

a spring pressed plunger to engage with the end oi each longitudinal bar and carried in one end oi an arm pivoted on the sinker sley, a catch bar to operate the sinkers and a cam on the catch bar to engage with the other end of the pivoted arm and rock the latter and compress the spring associated with the plunger and apply end pressure to the longitudinal bar associated therewith, substantially as described.

a. In a straight-bar knitting machine a sinker sley, a set oi sinkers, a longitudinal bar or bars disposed in a recess in the sinker sley provided with gates to engage with the sinkers, longitudinal channels across which the sinkers extend disposed at the sides oi the longitudinal bar or 40 bars, a plunger to engage with the end of each longitudinal bar, carried in the end oi a pivoted arm, a spring associated with each plunger to apply end pressure to the longitudinal bar associated therewith, an adjusting screw to adjust the 45 pressure oi the spring, a catch bar to operate the sinkers and a cam associated therewith to engage the free end of the pivoted arm and apply the end wessure on the longitudinal bar, substantially as described. 50'

HARRY WILFRED START. ERNEST START. 

